declarative mood vs mood

declarative mood and mood both are nouns.

Word	Noun	Adjective	Verb	Adverb
declarative mood	Yes	No	No	No
mood	Yes	No	No	No

As nouns, mood is a hypernym of declarative mood; that is, mood is a word with a broader meaning than declarative mood:

declarative mood: a mood (grammatically unmarked) that represents the act or state as an objective fact
mood: verb inflections that express how the action or state is conceived by the speaker

Other hypernyms of declarative mood include modality, mode.

declarative mood (noun)	mood (noun)
a mood (grammatically unmarked) that represents the act or state as an objective fact	a characteristic (habitual or relatively temporary) state of feeling
	verb inflections that express how the action or state is conceived by the speaker
	the prevailing psychological state